How to resize image in Mac OS X

macA friend ask me, how to resize image in Mac without install 3rd party program. Actually the default image viewer in Mac (Preview) can be use to resize image. Not many people know Preview can be used to resize image, and perform some simple image processing like adjust color, flip image, crop image and etc.

To resize image in Mac OS X, follow the steps below:-


  • Open your Finder -> double click on the image you want to resize
  • Now Preview will launch n show the image you double click
  • Click on Tools -> Adjust Size, a Image dimension window will pop up and you can enter the size you want here and the image will be resize!
  • Once the image resized, you have to save your image by click on “File” -> “Save as” and enter a file name for your new image. If you decided to overwrite the image file, then you can click “File” -> “Save” or press Command + S

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10 Responses to “How to resize image in Mac OS X”

  1. Jorge says:

    Many Thanks, keep it up.

  2. Great Big Sea says:

    Thanks for putting this information together, hugely helpful. Keep up the great work ­čÖé

  3. Asia says:

    For resizing I prefer this one
    Far more options

  4. Rubish says:

    This is not useful at all, there’s is NO ” resize image” or any choice to enter pixel under my preview tool menu. Why?? I’m using mac tiger! I need to size a pic to exact dimensions but I cannot find a way to do it!! Its rubbish

  5. Linda says:

    Wow, great tip. Thank you. The only image processing I require is resizing and cropping. Using the Preview is a great way to accomplish this. Thanks again.

  6. elrei says:

    ¡Muchas gracias!

  7. Les Hovey says:

    Pure Magic. I’d been using this without knowing what I was doing.

  8. Ray says:

    This was very informative. I was pulling my hair out trying to use aperture and Iphoto

  9. Rebecca says:

    Thanks a bunch. Saved me a crap load of time.

  10. MrHeavytunes says:

    Thanks for the article, it was very informative!

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